Minor nit: the 3-cylinder description is incorrect; this engine has only 2 cylinders.EVBob wrote:It looks like Workhorse will indeed use the 3 cylinder i3 REx engine/generator for the pickup
s (w-15) range extender. : https://www.trucks.com/2018/03/12/workh ... ric-truck/
I think Workhorse envisions this truck being used at moderate city and suburban speeds rather than long distances at highway speeds. I'm sure that the REx engine will be able to be started manually in situations where its output is less than the power being consumed which would slow the discharge of the battery pack. Maybe it would turn on automatically when the power being consumed exceeds the REx engine's maximum output.EVBob wrote:Workhorse mentioned they were testing other (bigger) gas engine generators - I am kinda surprised they decided to stick with the i3 REx engine...I found it just barely covers slightly slower than average highway driving in Eco-Pro - I wouldn't think it would have enough output for a much heavier/larger pickup truck (it has two larger traction motors vs the single in the i3) that will be hauling around more cargo....For it to get 310 miles with the 40kwh available battery that will get 80 miles by itself (they will use a 60kwh passive cooled battery - but only allow 40kwh to be utilized) , unless the REx was set to start running at 90% battery and its Rev speed wasn't tied to speed of the vehicle...
Yes.viking79 wrote:Running the Rex above 75 or 85% could damage the battery. Also, I think the C650 scooter makes about twice the power with the same engine?
Limitation is most likely in the charge rate of the battery and generator output. If the genset put out 44 kW, that would be like a 2C charge rate for 22 kWh pack.
However, it seems like they could program the engine to only run at those RPMs when electric motor has demands above a certain level to not damage the battery.
I am not following this truck,viking79 wrote:How do we know this is the i3 engine? I find that highly unlikely, the statement says 1.5 L 3 cylinder.
This is almost certainly the i8 1.5L 3 cyl that makes 220 hp. The i3 rex engine would explode trying to power such a large truck, 220 hp would probably keep it moving 80 mph down the highway with a dead battery. The i3 engine barely keeps my i3 going 65 mph, long hills are almost nogo. And the i3 is like half the size and way more aerodynamic.
The REx engine used is confusing. Workhorse's own Website doesn't specify the W-15 Pickup's REx engine, but it does specify the BMW i3's W20 REx engine in its larger e-Gen step van (UPS delivery van). It seems likely that Workhorse would use the same REx engine in all of its vehicles, especially the i3's W20 that is already mated to a generator unlike the i8's engine.viking79 wrote:How do we know this is the i3 engine? I find that highly unlikely, the statement says 1.5 L 3 cylinder.